You're forgetting all the birther nonsense he spouted during the Obama elections, people called him out as racist then. He was even sued for racist policies at his apartments, people called him out then. The problem isn't that people never called out his racism it's people and the media conveniently forget his past racist actions.

He's been sued multiple times over his racist policies (You can't be black and work the high rollers section at his casinos.) Ivana Trump swore in court that he assulted and violently raped her. Plus he settled an attempted rape case out of court in the 90's. Then there are all the reports of his mafia ties. It's been around for years. Google is your friend

Becase it didn't matter when he was still working in the private sector. Now that he wants to hold elected office, it matters.

Also, I can't help but notice that his stances have gotten more and more xenophobic and bigoted the longer he's spent pandering the the GOP base. There's something fishy about a guy who spends decades not expressing any strong opinions about an issue despite being a notorious spotlight hog, but then suddenly having very strong and vocal opinions about the same issue right around the time he suddenly needs everybody's vote.

Before he was simply just another despicable, self-indulgent, narcissistic, racist, misogynistic, xenophobic billionaire. Now he wants to be the leader of the free world. I would guess people are finally beginning to realize there comes a time when you just have to draw the line somewhere.

Every candidate gets shit on in some way. Usually the accusations are something that voters on the opposing side would find especially offensive. Trump is none of those things. If people would do research for themselves instead of trusting biased media outlets they might see that he is the opposite of those things.